So as the previous guides deal with a, now patched, glitch I figured it’d be a good call to throw out some hints and tips I learned by doing this the hard way.
To get this achievement you are going to need to gather a total of 95 items. 53 minerals and 42 artifacts which will need to be taken to Gunther in the museum.
The museum is in the south east corner of Pelican town, over the bridge and south of the blacksmiths hut.
Bringing up your menu allows you to see how many items from each area you have collected and are short. Note that minerals and artifacts collected show up as soon as you collect them, even if you haven’t dropped them into the museum yet so it’s worth taking any new collectables you find straight away.
When finished your collection pages should look like this.
If you are going through the game normally you should get most of these in the process of picking up the other achievements.
I got all but 4 artifacts and 2 minerals without having to do any grinding, though I confess I did regularly refer to the wiki for help to complete subquests.
So here’s a quick breakdown of the various items in order and how you can get each one. I’m not going to post an exhaustive list of where each one can be found, just the most common occurrences of each. Just be aware that some items can be picked up through other means then those listed, my first ruby was given to me as a gift during the feast of the winter star festival for example. Geodes:
Geodes are your key to opening up all the different minerals and a couple of the artifacts so it’s important to know where you can find the different types.
They come in 4 types. Geodes, Omni Geodes, Frozen Geodes and Magma Geodes. These can be opened by Clint the blacksmith in Pelican town for 25g.
Geodes: Chance to drop whilst breaking any stone above ground or in the mine (higher chance in mine levels (1-39). Dropped by Duggies (25%), produce of stonefish pond (pop 9). Found whilst tilling soil in farm.
Omni Geodes: Chance to drop from breaking stone at every level of the mines, skull cavern and quarry cavern. Dropped by carbon ghosts (99%, skull cavern). Produced by octopus fish pond (pop 9).
Frozen geodes: Chance to drop from breaking stone in the mines (level 41-79. Produced by ice pip fish pond (pop 9).
Magma Geode: Chance to drop from breaking stone in the mines (level 81-119). Chance drop from breaking crates and barrels in skull cavern. Produced by lava eel fish pond (pop 9).Artifacts
Artifacts are a whole different ball game though at first it’ll seem like they are identical to minerals and you won’t know why they’re kept on a separate list. Very few artifacts are found inside geodes. Instead they are more commonly found in artifact spots around the surface of the world. These are identified by patches of dirt, sand or snow with worms wiggling aboutAn artifact spot (the infamous sand wigglers)
Most artifact spots will contain something other than an artifact (stone, clay, wild seeds, yam) but a handful of artifacts are only obtainable by smacking the artifact spot with your hoe.
It’s also worth noting that artifact spots in different areas will have a different list of artifacts that can be found there (no dried starfish or anchors in the Calico desert for example). Several artifacts are given as rewards for certain subquests and missions so if you’ve been trying to get everything done that the game has to offer you will get a load of these as you progress.
There are also several which can be gained by buying artifact troves from the trader in the calico desert, he will trade 5 omni geodes for a single artifact trove which the blacksmith can open. If you find you have all of the minerals you require it’s worth stockpiling omni geodes for this purpose if you are still missing artifacts.
Quarry: For the sake of artifact spots the quarry counts as part of the mountains.
Winter artifact hunting: Because everything in winter is covered in snow, more artifact spots are able to generate in areas where previously they couldn’t because it was grass. If you’re having trouble finding a specific artifact it might be worth waiting until winter when you might have more spawnable surfaces. This isn’t true for items on the beach or desert and makes minimal impact on artifacts which spawn at the railroad, but it’s handy for those elusive town or forest artifacts.
Wilderness farms: Wilderness golems have a chance of dropping diamonds, earth crystals or prismatic shards, wilderness golems can only be found if the wilderness map is chosen for the players farm at the start of the game.
Fishing chests: Fishing chests are an alternative way of gaining some of these artifacts or minerals, you’ll almost certainly pick up one or two this way; but the list of possible items in the fishing chest is large, there is a chance that when you are fishing you might not get a chest pop up and even if you do get a chest to appear in the minigame you might not be able to catch it/catching it might lose you the fish and therefore the chest. As such I’ve put it here as a mention but unless you assign your professions and gear yourself solely to getting chests (which is possible) you can’t really rely on it.
Luck: Whilst luck makes a difference on how often geodes will drop from rocks it does not effect what items are found within geodes. With that in mind it's worth using good luck days for collecting geodes from the mines and bad luck days for having the blacksmith open any geodes you've opened. You can find out what the luck for the day is like on your tv in your house.
Well that’s all I can think of, if you can think of any more information which I could add to here, please let me know, I hope this helps some of you out. Almost all of the percentages from these lists came from the official stardew valley wiki, not my own data collection.